package org;

public class Demo {
    public static void main(String[] args) {
        // java """3个引号是 block块字符串 13014577033
        //String str = """
        //String s = "hello";
        //String a = s.toUpperCase();
        //s = "6";
        //System.out.println(s);
        //System.out.println(a);
        //
        //String cc = "aaaa";
        //
        //char[] cs = {'a','b','c'};
        //System.out.println(new String(cs));
        //
        //char[] ccc = "abcd".toCharArray();
        //System.out.println(ccc);
        //        """;
        String str = "ok";
        System.out.println("---------------------------");
        System.out.println(str);
    }
}
